We now construct a new model with a single pump and four actuators. The same pump pressure p1 drives each cylinder assembly and the sum of their flows loads the pump. Although each of the four control valves could be controlled independently, as in an active suspension system, in this case all four receive the same commands, a linear ramp in orifice area from zero to 0.002 m^2.
A detailed review of the equations used in this design can be found in the white paper Using Simulink and Stateflow for Automotive Examples. Please note that this paper is based on an older version of Simulink and does not use all the newest block diagramming features in the current version of Simulink.
